Rock-drill



5 Sheets-Sheet 1l.

ROCK DRILL.

PatentedDec. 8, 1896.

(No Model.)

J. F. BLSLEY 8u F; Gi PRIESTLY.

f 5 sheets-#sheet 2. J. F. BALSLBY &-P. C. PRIBSTLY.

ROCK DRIL'L.-

Patented Deo. 8, 1896.

(No Model.)

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J. F. BALSLEY 8v FLC. PRIESTLY. ROCK DRILL.

No. 572,865. Patented-Dec. 8, 1896.

A Trim/F v 5 SheetsQ-Sheet 4.

` Patented Deo. 8, 18961.

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(No Model.)

J. vP. BALSLEY ze F. e. PRIBSTLY.

ROCK DRILL.

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-J. F. BALSLBY xv P. C. PRESTLY.

ROCK DRILL.

Patented Deo. 8, 1896.

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NITED STATES PATENT OFFICE.

JOSEPH F. BALSLEY AND FRANK O. PRIESTLY, OF DENVER, COLORADO.

ROCK-DRILL..

SPECIFICATION forming `part of Letters Patent No. 572,855, dated December 8, 1896. Application filed March 19, 1896.. Serial No. 583,865- (No model.)

To all 'whom t ntay concern:

paratively simple and very efficient machine of this kind which has its parts arranged in such a way as to work practically without getting out of repair, which has means for 'accelerating the movement of the hammer as it strikes the drill, so as to deliver a free blow, and which has a particularly effective means of operatingthe mechanism for turning the drill and swinging the hammer electrically, enabling solenoids to be used with particularly good effect and rapid action.

A further object of our invention is to arrange the working parts of the drill in a housing or case which is of such a structure that the drill can be easily transported and readily set up ready for use.

To these ends our invention consists of certain features of construction and combinations of parts which will be hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar figures and letters of reference indicate corresponding parts in all the views.

Figure 1 is a central longitudinal section of the drill embodying our invention. Fig. 2 is a broken detail view, partly in section, of one form of device used in turning the drill. Fig. 3 is a cross-section on the line 3 t of Fig. 1, looking in the direction of the upper arrow. Fig. 4t is a cross-section on the line 34 of Fig. 1, lookingin the direction of the lower arrow. Fig. 5 is a detail perspective view showing the connection of the drill-turning lever with the links which operate it. Fig. 6 is a broken enlarged side elevation of the drill-turning lever and the mechanism which it carries. Fig. 7 is a vertical section on the line 7 7 of Fig.

forms of magnets; view of a modified means of operating the 16. Fig. 8 is a vertical section on the line S S of Fig. 6.

Fig. 9 is a broken detail side ele vation of a part of the drill with the turning and locking collars thereon. Fig. 10 is a broken perspective view illustrating modiiied Fig. 11 is a broken plan drill to pull it back and turn it. Fig. 12`is a ,longitudinal section on the line l2 12 of Fig.

11. Fig. 13 is a cross-section on the line 13 13 of Fig. 12. Fig. let is a sectional elevation on the line let 14 of Fig. 13. Fig. 15 is a central longitudinal section of a modified form of the drill, showing a duplex arrangement of the hammers. Fig. 16 is a cross-section on the line 16 16 of Fig. 15. Fig. 17 is a detail cross-section on the line 17 17 of Fig. 15 and shows the mechanism for pulling back the drill preparatory to turning it, and Fig. 18 isadetail elevation of one of the arms of the walking-beam which actuates thedrillpulling mechanism The drill vis provided with a compact housing or case 10, which has a thickened bottom 11, with side flanges 12, (see Fig. 3,) which run in ways 13 of the base 14, which base is preferably provided with a depending anchor or boss 15, (see Fig. 1,) which can be let into a tripod or bar and thus made to hold the drill-frame steady. VBeneath the housing 10 is a longitudinal screw 16, which turns in a nut 17 on the bottom of the housing and is journaled in an upturned end of the base 14, the said screw having a squared end 13, by which it may be turned so as to advance the housing as fast as the drill cuts its way into the rock. We have shown no mechanism for turning this screw, but if automatic mechanism is applied to it it will not interfere with the principle of this present invention.

The machine is provided with a drill 19, which can be of any approved kind, but which is longitudinally ribbed to enable it to be conveniently turned, and, as shown in Fig. 1, this drill turns in short holders 20, which fit it and which are journaled in the upper part and front end of the housing 10, but, if desired7 along drill-holder21, as shown in Figs. 11, 12, and 15 'and hereinafter more specifically described,l can be used.

The drill is struck by a swinging hammer IOO , presently described, a movable pivot or center is furnished for the hammer-shank, which is an important feature, as the center advances at the same time the hammer is swung, and so a tremendous blow is delivered by the hammer. The links 25 are at one end pivoted, as shown at 26, to the rocking arm 27, which is pivoted as shown at 28, and which has a bent upper end 29, carrying rollers 30, which clasp the hammershank 23, and so when the arm is -swung back and forth the shank is swung likewise. Thefhammer-shank is vpr-ovided with an offset or cam 32, which isengaged by oneof the rollers just before the hammer strikes the drill, and so an accelerated movement is given to the hammer, causing it to deliver a free swinging blow on the drill. The front ends of the links 25 are pivoted, asshown at 23, to the lower end of the walking-beam 34, which is pivoted,V at its center,i as shown at 35, and the pivots 33 extend into slots 36 of the armatures or plungers 37, which are alternately actuated by the solenoids38, these solenoids having the usual stops 39 to limit the inward movement of the'rplungers.

Inv Fig. 10 is shown an arrangement for gi ving a horseshoe magnetic effect to the solenoids. 38 represents a solenoid without an iron jacket, which arrangement is used when it is desired to connect the two cores in a horseshoel magnetic circuit by means of an iron plate 40, but when the cores are isolated an` iron jacket 41 is. employed, and then a.

brassplateis used'instead ofthe iron plate 40.

It will be'observed that the alternate energizing'of the solenoids causes the plungers to be reciprocated and the walking-beam to be tilted, which impartsa movement to the hammershankwhich' will be more particularly described hereinafter.

The solenoids are alternately energized by means of any suitable switch, butV we have shown a. switch A (see Fig. 1) in a general way to illustrate how the apparatus is worked. The switch A connects by Wires a a' b Z9 with the two solenoids, which also have connections-CZ d, and by the operation'oftheswitch the circuit is rapidly shifted from 011e solenoid to the other.

In order that the drill 19 may be` pulled back slightly after each blowy and easily turned, it is provided with a squared collar 42, (see Figs. 1 and 6 to 9,) which lits in a washer 43, which is held in a sleeve 4.4, and the washer 43 has at one end ratchet-teeth connecting with similar teeth on the sleeve; as shown at 45 in Fig. 2. The sleeve-44 hasoppositeand outwardly'-projecting pins 46, which extend through slots 47 in the cylindrical upper end' 48 of the lever 49, which lever is fulcrumed'as shown at 50,.and has its lower end connected with hooks 51 of the links 25, as best shown in Fig. 5. The pins 46 enter the diagonal grooves 52 in the stationary plates 53, which are rigidly secured to the main frame or housing 10, and thus as the lever 49 tilts it carries back the sleeve 44,

washer 43, and drill 19,while at the same time the pins strike the walls of the grooves 52, turning the sleeve 44, which also turns the Washer 43 and drill 19, so that the drill when Lnext struck strikes in a different position in the drill-hole precisely as ifturned by hand.

To hold the drill from turning while a blow is to be delivered, it has a squared collar 54,

'which is preferably hexagonal or octagonal,`

sothat it will not be too securely held, and this collar engages a socket 55 (see Fig. 3) of the latch 56,which is held at its ends on head- `ed pins 57, the latch at'one end being slotted laterally, as shown at 57a, so that it can be disengaged from thedrill when desired. The pins 57 are pushed forward by springs 58, ,which are held in sockets 59, (see Figs. 7 and 8,) and thus the tension: of the spring throws the drill forward to a bearing before it is struck by the hammer.

Instead of holding and turning the drill precisely as above described the drill-holder 21 can be arranged as shown in Figs. 11 to 13. Here it is substituted for the short drill-holders 2O and is pressed forward by a spring GO, which carries the drill against therock, but in order that the drill may be pulled. backward it has a collar 6l, (see Fig. 12,) which engages the rear end of the drill-holder 21, on which there is an inclined collar 62, which is adapted to be engaged on opposite sides by the hooks 63 ofthe latches 64, which are pivoted at the upper end tota forked lever 493, which operates like the lever 49 already described. When the lever is tilted so that its upper end' swings back, the latches 64 pull back the drill-holder 21 against the tension of the spring 60, so that the drill can be turned, and when the latches are released the drill is thrown forward again, as presently described. The rear ends of the latches 64 are inclined or curved, as shown at 65, and in the paths lof these inclined ends are stops 66, against vwhich the latches strike,.thus releasing the hooks 63. and freeingA the drill-holder.

Near the front end of the drill-holder is a ratchet-wheel 67 which is rigid on the drill- `holder and which is claspedby the connected collars 68 and 69, which carry a spring-pressed pawl 70,. (see Fig. 13,) which engages the ratchet-wheel'. These collars are also pressed bythe spring 60so` as to throw the drilly holder anddrill forward when. the drill-holder isreleased, as above described. The collars 68 and 69 also carry pins 7l, which engage grooves 52 in the plates 53, these grooves being' like those already describedk for turning the drill-holder. When. the drill-holder is Ipulledy back, the pins 71 enter the grooves 52 and the collars are turned, whilethe pawl IOO IIO

IZO

imparts a similar movement to the ratchetwheel 67 and drill-holder 21; but when the drill-holder is moved forward the collars are moved back and the pawl travels back over the ratchet-teeth without turning the drillholder, which is held in place temporarily by a pawl or detent 72, which is provided with guide-pins 73, moving in holes in the case-top, and is pressed downward by a spring 74. (See Fig. 12.)

If desired, the hammers maybe duplicated, so as to strike very rapid blows on the drill, this arrangement being shown in Figs. 15 to 1S, and where this duplicate arrangement is used the drill-holder 21 or equivalent holder is preferably arranged between the solenoids 33, the hammers 22, shanks 23, and rocking arms 27 as already described, except that one hammer and its actuating mechanism are located directly opposite the other and the short end of each rocking arm 27 connects by links 75, to which the hammer-shank is pivoted, with a rocking lever 76, which is pivoted as shown as `77, and connects also with one end of the walking-beam 34a, which is substantially like the walking-beam 34 already described and is actuated in like manner by the solenoid-plun gers 37. It will be observed that when this arrangement is used one hammer 32 swings forward to strike the drill while the other swings backward. When this arrangement just described is used, the drillholder and drill can be conveniently turned by means of forwardly-extending arms 7 8 on the central part of the walking-beam 34, each of which arms is provided with a cam-slot 7 9 to receive a pin 8O on the loose collar 31, which is carried by the drill-holder 21, and it will be noticed that the rocking of the arm 7 8 will cause the pin 8O to travel in the groove or slot 7 9 so as to move the collar 31 and drill-holder 21 backward and forward.

rlhe drill-holder 2l, when arranged as in Fig. 15, has a ratchet-wheel 82 at its rear end,

which is engaged on opposite sides by the oppositely-pitched pawls 83, which are carried by the arms 7 S, and so when the arms 7 8 rock and pull the drill-holder and drill back the pawls engage the ratchet-wheel and turn the drill-holder and drill to bring the latter into the right position to receive a new blow.

The operation of the single drill shown in Fig. 1 is as follows: When the upper plunger 37 is pulled forward, as in Fig. 1, the walkin gbeam 34 is tilted and the lower end of the walking-beam is turned backward, thus moving back the links 25 and tilting the arm 27, so as to swing the upper end of the arm forward. This carries with it the hammer-shank 23, and just before the hammer reaches the drill the rear roller 30 strikes the cam 32 and gives an accelerated movement to the hammer.

the lower plunger 37 is pulled forward, the opposite effect ensues, the lower end of the arm 27 being pulled forward and the upper end thrown back, carrying with it the hammer-shank 23, and the hammer swings down upon the cushion 22, At the same time the rear end of the lever 49 is struck by the enlarged journal 25b of the links 25, (see Fig. 5,) and the lever 49 is tilted so as to throw its lower end forward and its upper end backward, this latter movement carrying back the drill by means of the sleeve 44 and washer 43, while the washer and drill are turned by means of the pins 46 and grooves 52, together with the ratchet connection between the washer 43 and sleeve 44. In this connection it will be understood that the grooves 52V on the opposite sides of the lever are of opposite pitch, so that when the hooks 5l engage the lever 49 and pull it forward the pins and sleeve are turned back by the action of the walls of the groove on the pins, but in the latter case the teeth of the sleeve 44 ride over the teeth of the washer 43 without turning the latter.

If the holder 21 (shown in Figs. 12 and 13) is used, the connection is similar, but the drill-holder is turned by the modified form of mechanism, the action of which has already been described.

When the duplex arrangement is used, the operation is substantially like that already described, except that the two hammers are alternately swung forward and the turning is effected by the rocking of the arms 78 in themanner previously explained.

Having thus described our invention, we claim as new and desire to secure by Letters Patent- 1. A rock-drill, comprising a drill-holder and a swinging hammer having its shank pivoted to a rigid support which slides back and forth with the swinging of the hammer,y substantiall y as described.

2. In a rock-drill, the combination of the tilting walking-beam, the tilting rocking arm, the link connecting one end of the rocking arm with the walking-beam, the swinging hammer having its shank pivoted on the aforesaid link, and a sliding connection between one end of the rocking arm and the hammershank, substantially as described.

3. A rock-drill, comprising a drill-holder, a swinging hammer, a tilting walking-beam, a pair of reciprocating armatures pivotally connected with opposite ends of the Walkingbeam, an operative connection between one end of the walking-beam and the hammershank, a tilting lever worked from the opposite end of the walking-beam, and mechanism operated by the lever to turn the drillholder, substantially as described.

4. A rock-drill, comprising a drill-holder, a swinging hammer, a tilting walking-beam, a rocking arm connected with the shank of the hammer, a link connection between the rocking arm and one end of the walking-beam, the said link carrying the hammer-shank, a tilting lever connected with the opposite end of the walking-beam, and means for turning the drill-holder by the tilting of the lever, substantially as described.

IOO

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5. The combination With the drill-holder, the drill having a collar thereon, the hammer, the hammer-swinging mechanism, and the tilting lever Worked by the ha1nmer-swingin g mechanism, of the Washer engaging the collar on the drill, the sleeve carried by the lever, held on the Washer and connected therewith by ratchet-teeth, the outwardlyprojecting pins on the sleeve, and the guide-plates having slots to receive the pins, substantially as described.

6. The combination With the tilting lever, the drill holding and turning mechanism carried thereby, and the squared collar on the drill, of the spring-pressed latch carried by the lever and provided With a socket to engage the squared collar7 substantially as described.

7. A rock-drill, comprising a pair of reciprocating armatures, magnets t0 operate the armatures, a Walking-beam tilted by the reciprocation of the armatures, a swinginghamp mer, and an operative connection between the hammer and the Walking-beam, substantially as described.

JOSEPH F. BALSLEY. FRANK C. PRIESTLY. lVitnesses:

RoDERIc WILLIAMS, ARTHUR XVILLIAMS. 

